This poster by the late Jeffery Jones is a pretty sweet image for a pretty sweet movie. Dragonslayer was a neat little mini-epic with outstanding special effects, even by today's standards, and an above average story of an apprentice dragonslayer having to fend off not only the monster but an entire village to boot.
The movie loses its way a bit in the spectacular ending which while visually compelling is at odds in tone to the rest of the movie, a bit too high octane.
Vermithrax Pejorative, the dragon remains the best evocation of a dragon on the screen that I've ever seen, and that's saying something given the advances in special effects since that time.
Here's a sketch Jones made as he constructed the poster.
Marvel adapted this movie with art by Marie Severin, and the cover above by Earl Norem is effective if not especially opulent.